Conair Thermolator TW-S User Manual page 77

C ont ro ller A l ar m s
When an alarm occurs, the Thermolator has detected a problem with the process. Without correction, the
TCU will not be able to produce process fluid of the correct temperature. Under certain conditions, an
alarm could lead to equipment damage or personal injury if it is not corrected.
Control Power
• The controller displays an error code indicating the cause of the problem.
Autostart Signal
• If the optional alarm package is installed, the Fault strobe will illuminate and the audible alarm will
Function
Pump
activate.
Alarm
Heat
Cool
Coolant Pressure Low
Venting
Low Coolant Inlet Pressure
The TCU fluid circuit does not
have enough pressure to operate
the pump or heater.
Program Mode
WARNING: Only qualified elec-
trical service personnel should
examine and correct problems
that require opening the unit's
electrical enclosure or checking
electrical current.
u COOLANT PRESSURE
LOW LED illuminates.
Optional strobe, sounds, dry
contacts actuated.
u Pump temporarily turns off.
u Heater temporarily turns off.
u Cooling valve continues to
regulate.
This alarm will automatically
reset when system pressure
returns. When it does, the TCU
will automatically resume nor-
mal operation.
Possible Cause
Is fresh water turned on to the
TCU?
Does your facility have the re-
quired water pressure to run the
TCU? Normally this is 25psi,
but may be significantly higher
on certain models.
Is the pressure switch faulty?
Solution
Be sure to turn on the water sup-
ply before starting the TCU. The
pressure status can be observed on
the COOLANT PRESSURE LOW
LED even when the TCU is not
running.
Observe the pressure indicated on
the pressure gauges. Compare this
to the minimum required operat-
ing pressure for your specific TCU
model.
Upgrade your facility plumbing
if necessary, or add an external
booster pump
If you are sure that sufficient water
pressure is present, test the pressure
switch with a VOM. Low pressure
should allow the switch to open,
whereas high pressure should cause
it to close.
(Continued)
Tr ou bl e s h oot i n g I 6-5